This issue could be due to presence of static charges or internal hardware malfunction of the notebook. To isolate the exact cause of the issue, perform the steps provided below.
Step 1: Hard Reset
To perform a hard reset, please follow the steps listed below:
1. Unplug the AC adapter from the notebook PC and remove from any port replicator or
docking station.
2. Remove the battery from the notebook battery compartment.
3. Press and hold down the power button for about 20 seconds.
4. Insert the battery and plug the AC adapter back into the notebook PC.
5. Press the power button to turn the notebook PC back on.
This will discharge the static charges from the notebook. Now turn on the notebook and check for the issue. If the issue persists, then remove and reseat the memory modules of the notebook and check for the issue.
Step 2: Remove and Reseat the Memory Modules
You can refer the service manual provided below for information to remove and reseat the memory modules of the notebook.
http://h10032.www1.hp.com/ctg/Manual/c01602064.pdf
Refer page no: 52 & 53
NOTE: PDF manuals require the Adobe Acrobat Reader for viewing and printing.
If
the issue persists after the above steps, then this could be due to internal hardware malfunction of the notebook and requires a detailed onsite diagnosis by a service technician. If your notebook is covered under HP Standard Warranty, then I would request you to contact HP Support to get your notebook repaired under warranty.
I believe the information provided would be helpful to isolate the issue with your notebook.
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